Allow ContextEntry to have fields to control plugins

[nightlark]

Users may want plugins (or core functionality?) to behave differently depending on the context entry block (e.g. includingAllFiles). The ContextEntry class should have support for a relatively free-form entry that can be used to control these additional settings, and relevant hooks (file type ID and info extractors) should be modified to have an optional context parameter for getting the current context. The existing context parameter for the info extractor hook should be modified to include the word queue in the parameter name to make it clearer what the existing parameter is for.